Electrochemical and metallurgical industry . electric current. Electric Furnace.—C. L. Saunders, 794,255, July 11. .Applica-tion filed Feb. 15, \ horizontal continuous annular trough form> a hearthwhich is rotated. The mrrent is supplied through electrodeson the hearth : stationary contact pieces outside are ccmnectedwith the supply circuit, and are engaged in moving contact bycontact pieces on the hearth. The charge is fed at one placeimo the hearth, passes through the electrically heated zone andis then discharged. The gases cscaix- through a pipe in thecover. Aftwatus for the Reduc
Electrochemical and metallurgical industry . electric current. Electric Furnace.—C. L. Saunders, 794,255, July 11. .Applica-tion filed Feb. 15, \ horizontal continuous annular trough form> a hearthwhich is rotated. The mrrent is supplied through electrodeson the hearth : stationary contact pieces outside are ccmnectedwith the supply circuit, and are engaged in moving contact bycontact pieces on the hearth. The charge is fed at one placeimo the hearth, passes through the electrically heated zone andis then discharged. The gases cscaix- through a pipe in thecover. Aftwatus for the Reduction of Iron Sand. Iron Oxide andother Suitable Substances.—]). R. S. (iaibraith, 796,312,.\ug. I. Application filed Oct. 27, sand is first freed from all silicious matter (evidentlyb\ magnetic concentration) and then treated in the electric fur-i;ace a shown in Fig. 3. The charge consists of the iron sand(iron oxide) and the necessary quantity of powdered char- September, 1905] ELECTROCHEMICAL AND METALLURGICAL INDUSTRY. 347. FIG. 3.—STEEL FURNACE. coal or Other reducing agent (together with a suitable flux ifthere is some silicious matter, etc., still mixed with the ironsand). The charge falls down upon and between tiers ofcarbon rods c, which are made incandescent by the passage ofan electric current, and may becovered at the upper surface withrefractory roofs. A reducing gasis introduced through g, and elec-tric resistances in form of rods iare inserted in this passage. Thereduced and molten metal ac-cumulates in the chamber h. Tapholes are provided q for the metaland p for the Oven.—L. E. Custer, 793,-424, June 27. Applicationfiled Sept. 14, of construction of anelectric muffle furnace for den-tists. The floor and walls of theheating chamber are made of por-ous material, and provided with perforations or grooves inwhich crimped or looped wires are arranged so as to evenlydistribute the heat. Electrolytic Alumini
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